US2398628A

US2398628A - Polishing precision surfaces

Info

Publication number: US2398628A
Application number: US522348A
Authority: US
Inventors: Walter J Dykoski; Lester F Borchardt
Original assignee: General Mills Inc
Current assignee: General Mills Inc
Priority date: 1944-02-14
Filing date: 1944-02-14
Publication date: 1946-04-16
Anticipated expiration: 1963-04-16

Description

lApri; 16, 194s.

- IFIGA w. JJDYK'osKl ErAL PoLIsHINePREcIsIoN suRFAcEs FiledFeb. 14, 1944 2 'sheets-sheet 1 -IOO 88 92 88 loo 9.4 9 /WE/vfoesf- WALTER J. DYKOSKI LESTER F; BOROHARDT ATTY.

April 16,v 1946. w. J. DYKOSKI' ET A. 2,398,628

` 1 POLISHING PRECISION SURFACES l Filed Feb. 14, 1944 2 Sheets-Sheet 2 ii. I 54 `E a4 64 50 38 es eo 56 40 (M E l y 78'. o ls2 vedi 3e e2 1 1^ WALTER J. DYKOSKI ,LESTER F. BORGHARDT /NVENTORSA With the parts assembled, as shown in F18. 5. the disk i8 is set in rotation while the arm 80 oscillates the multiple head i6 and this causes the'blank assemblies to be moved across the pitch lap surface 20 as it is rotated. A suitable polishing material as rouge is kept on this surface.

By this arrangement a surprisingly uniform and accurate polishing of the blanks is obtained but it is advisable that the weights |02 shall be considerably greater than the weight 96, in fact Where an opening in the center of the back of l the blank 90 is not objectionable, it may be made to receive the lower ends of the pins 8d and I0@ with the elimination'cf the spuds B8. A spring can be used instead of the weights |02 and the spuds can be enlarged to serve this same purpose. In any case the point of contact of the driving pin must be as low as possible to render the assembly in stable equilibrium.

The

parts

90 and 94 are assembled by laying them on a flat surface and then the surrounds 94 are causedto adhere to the blank 9o by means of a suitable mixture of resin and wax. 'I'hus the lower surfaces of all these members are fixed substantially in a plane.

The above description applies particularly to polishing on` a pitch lap surface but this apparagie embodiment of our invention, it is to be understood that it is capable of many modifications. Changes, therefore, may b e made which do not depart from the spirit and scope of our invention as disclosed in the'appended claims.

We claim as our invention:

l. In a machine of the class described for grinding blanks, a disk, a fiat unbroken grooved pitch lap surface on the disk, means for rotating the disk about its axis, an arm adapted to oscillate above the disk substantially across its axis, a member mounted to rotate freely about an axis in the arm substantially parallel to the axis of the disk, a pivot pin journalled in the axis of the member, a plurality of pivot pins journalled in the member parallel to said axis and uniformly spaced equidistant therefrom, each of said pivot as the polishing proceeds. Y

2. In a machine of the class described for' aseaeas t grinding blanks, a disk, a iiat unbroken grooved pitch lap surface on the disk, means for rotating the disk about its axis, an arm adapted to asciilate above the disk substantially across its axis, a member mounted to rotate freely about an am's in the arm substantially parallel to the axis of the disk, a pivot pin journalledin the axis of the member, a pluralit'yof pivot pins iournalled in the member parallel to said axis and uniformly spaced equidistant therefrom, each of said pivot pins being adapted to slide up and down with respect to said member, a weight on the upper` ends of each of said pivot pins, and spuds each having a universal movement on the lower end of one of said pivot pins so as to yieidinglypress 'each spud and a blank carried thereby toward the disk and to enable it to accommodate the blank to the rotating surface of the disk, the weight on the center pivot pin being substantially onehalf that on each of the outer pivot pins so as to maintain the pitch lap top surface substantially at as the polishing proceeds.

3. In a machine oi the class described for grinding blanks, a disk, a fiat unbroken grooved pitch lap. surface on the disk, means for rotating the disk about its axis, an arm adapted to oscillate above the disk substantially across its axis,`a member mounted to rotate freely about an axis in the arm substantially parallel to the axis of the disk, a pivot pin journalled in the axis of the member, six uniformly-spaced pivot pins journalled in the member parallel to said axis and uniformlyy spaced equidistant therefrom, each of said pivot pins being adapted to slide up and down with respect to said member, a weight on the upper ends of each of lsaid pivot pins, and spuds each \having a universal movement on the lower end of one of said Pivot pins so as to yieldingly press each spud and ablank carried thereby toward the disk and to enable it to accommodate the blank to the rotating surface of the disk so as to maintain the pitch lap top surface substantially iiat as the polishing proceeds.

4. In a machine of the class described for grinding blanks, a disk, a flat unbroken srooved pitch lap surface on the disk, means for rotating the disk about its axis, an arm adapted to oscillate above the disk substantially across its axis, a member mounted to rotate freely about an axis in the arm substantially parallel to the axis of the disk, a pivot pin journalled in the axis of the member, six uniformly-spaced pivot -pins ,'loiirnalled` in the member parallel to said axis and uniformly spaced equidistant therefrom, each-of said pivot pins being adapted to slide up and down with respect to saidmemberf'weight on the upper ends of each of said Divot pins, and spuds each having a universal movement on the lower end of one of said pivot pins so as to yieldingly press each spud and a blank carried thereby toward the disk and to enable it to accommodate the blank to the rotating surface of the disk, the weight on the center pivot pin being substantially one-half that on each of the outer pivot pins so as to maintain the pitch lap top surface substantially ilat as the polishing proceeds.

WALTER J. DYKOSKI.

LESTER F. BORCHARDT.